Studies in Fruit Flies. Part L Dacini — Hardy AND AdaCHI 
179 
Dacus obscuratus de Meijere, 1914, Tijdschr. 
V. Ent. 57: 189. 
This species apparently is related to D. 
dorsalis Hendel and differs by having no post- 
sutural yellow vittae on the mesonotum. In 
this regard it would fit close to D. tillyardi 
(Perkins), but it lacks the infuscation along 
the crossveins. 
Length: Body and wings, 5.0 mm. 
TYPE LOCALITY: Enkhuizen Island, near 
Batavia, Java. 
Type in the Zoologisch Museum, Am- 
sterdam. 
We have not seen this species. 
Dacus (Strumeta) pectoralis Walker 
Fig. 19 
Dacus pectoralis Walker, 1859, Linn. Soc. Lon- 
don, Proc. 3: 114 (nec Dacus pectoralis 
Walker, 1861, Ent. Soc. London, Trans, 
(n.s.) 5: 322, synonym of Dacus (Dacus) 
hivittatus cucumaris Sack). 
This species has never been properly placed 
and has commonly been treated as a synonym 
of D. hivittatus (Bigot) (armatus of authors) 
based upon D. pectoralis Walker 1861 not 
1859. Dr. K. L. Knight studied the type in 
the British Museum and supplied the details 
which have enabled us to place this as a 
Strumeta related to D. nigrotihialis (Perkins), 
luzonae n. sp., and parvulus Hendel. It is dis- 
tinguished from the former by its chiefly yel- 
low face and by having a pale band on the 
apex of the second abdominal segment. It is 
distinguished from luzonae by having the ab- 
domen all black except for the pale band on 
the second segment, by having small facial 
spots and three pollinose stripes extending 
down the mesonotum. Aside from the sub- 
generic characters and the details referred to 
above, Dr. Knight reported that the scutellum 
is all pale; a pair of spots is present below the 
antennae; the wings are marked as in dorsalis; 
the legs are dark colored; the first tarsal seg- 
ment is paler; the mesonotum is chiefly black 
with two postsutural yellow vittae. "The spe- 
cies is really quite close to dorsalis. It is 
slightly larger, darker; abdomen marked dif- 
ferently." 
D. pectoralis appears to be very close to D. 
parvulus (1912: 21-22) from Formosa 
and India (Philip, 1950: 32). From the original 
descriptions, from Dr, Knight’s notes on the 
type of pectoralis and Shiraki’s description of 
parvulus (1933: 54), we are unable to find 
satisfactory characters for separating these. 
They do appear to differ in size; the body 
length of D. parvulus is 4. 0-5.0 mm., whereas 
that of pectoralis is 6.5 mm.; this range is, 
however, too slight to be of particular im- 
portance. A careful comparison of the two 
will be necessary before their relationship can 
be clearly understood. 
Two males and one female are on hand 
which may possibly be pectoralis; they fit the 
descriptions in most details; they are briefly 
described as follows. Head: Two pairs of in- 
ferior fronto-orbital and one pair of superior 
fronto-orbital bristles are present. The front 
is twice as long as wide and is parallel sided. 
The facial spots are moderate in size, are as 
wide as the third antennal segment, and are 
oblong in shape. The third antennal segmens 
is reddish brown and is about 3.5 times as 
long as wide. Thorax: The mesonotum is en- 
Fig. 19. Dacus {Strumeta) pectoralis Walker, a, Ex- 
tended ovipositor; h, apex of piercer. 
